Queenan J T, O'Brien G D
Am Fam Physician. 1982 Apr;25(4):165-7.
Ultrasound measurement of the fetal femur length during the second trimester is now possible and is a good indicator of fetal age, comparing favorably with measurement of fetal biparietal diameter. It is a simple technique and can be performed quickly. The prospect of the first fetal physical examination is fast becoming a reality, and this technique adds a new dimension.
孕中期通过超声测量胎儿股骨长度现已可行，且是评估胎儿孕周的良好指标，与测量胎儿双顶径相比具有优势。这是一项简单的技术，操作迅速。首次对胎儿进行体格检查的前景正迅速成为现实，而这项技术增添了新的内容。
